Swinging mechanism for booms of excavating-machines.



C. B. KING & B. JACOBY. SWINGING MECHANISM FOR BOOMS 0F EXCAVATING MACHINES.

- APPLICATION HLED NOV. m. 1913..

1,169,836. Patented Feb. 1, 1916.

awvamtozil Ohar Ie/s B. King,

Ben amin Jaoob THE COLUMBIA PLANouRAPH ,co., WASHINGNN, n. c,

UNITED sTAT s PATENT some.

CHARLES B. KING- AND BENJAMIN JACOBY, OF MARION, OHIO, ASSIGNORS TO THE MARION STEAM SI-IOVEL COMPANY, OF MARION, OHIO, A CORPORATION OF OHIO.

SWINGING- MECHANISM FOR BOOMS OF EXCAVATING-MACHINES.

To all whom it mag] concern Be it known that we, CHARLES B. KING and BENJAMIN JACOBY, citizens of the United States, residing at Marion, in the county of Marionand State of Ohio, have invented certain new and useful Improvements in Swinging Mechanism for Booms of Excavating-Machines, of which the following is a specification, reference being had thereln to the accompanying drawing.

' This invention relates to swinging mechanism for booms of excavating machines. In machines of this character there is a strong endwise thrust imposed upon the drum during the swinging of the boom and much difficulty has been experienced in holding the drum against longitudinal movement onits shaft and, if the drum is successfully locked to the shaft, in preventing the springing of the frames in which the shaft is mounted, which would throw-the bearings out of alinement and interfere with the operation of the other mechanism mounted upon the frame.

The object of the invention is to provide means whereby the drum will be securely held against endwise movement and the frame members held against displacement due to the thrust imposed thereon by the drum and its shaft.

In the accompanying drawings, Figure 1 is a side elevation of the frame supporting the swinging drum; Fig. 2 is a horizontal sectional view taken through the drum and the bearings therefor; and Fig. 3 is a detail view of the bearing face of one of the caps.

In these drawings we have illustrated our invention as applied to the swinging mechanism of a well known form of steam shovel. As here shown this mechanism comprises a drum 1 about which extends a cable 2 which is connected with and imparts swinging movement to the boom, the latter not being shown. The drum 1 is mounted upon a shaft 3 which is journaled in bearings 4 in the frame members 5. These frame members are of considerable height, to accommodate the mechanism which is mounted thereon,

and the bearings for the shaft 3 are formed in the uppermost portions thereof. The

Specification of Letters Patent.

Patented Feb. 1, 1916.

Application filed November 10, 1913. Serial No. 800,074.

from a suitable engine which is not here shown.

As the cable 2 travels toward the end of the drum an endwise thrust is imposed upon the drum and this thrust imposes a severe strain upon the fastening devices by means of which the drum is held in place on its shaft.- To effectually resist the tendency of the drum to move lengthwise of the shaft spacing sleeves or collars 9 are interposed between the ends of the hub of the drum and the adjacent frame members 5, thereby interposing a rigid connection between the ends of the drum and the frame members which will prevent the relative movement of these parts lengthwise of the shaft. connection, however, is such that the strain imposed thereon is transferred to the frame members and as a result the frame members themselves may be sprung apart, the displacement sometimes amounting to as much as a quarter of an inch. Obviously, such displacement of the frame members throws the bearings badly out of alinement and interferes with the operation of all the mechanisms carried by the frame members. To hold the frame members against displacement we have utilized the rotating shaft itself and have provided the same on its outer ends with caps or looking plates 10 which are rigidly secured to the respective ends of the shaft and held against rotation relatively thereto. The frame members are provided with bearing surfaces against which the caps 10 bear and the faces of the caps may be provided with oil grooves 11 to lubricate this bearing surface.

It will be apparent, therefore, that by means of this construction we very effectually tie together the several parts of the mechanism and prevent all relative movement of these parts lengthwise of the shaft. The arrangement is such as to oppose a very rigid construction to the lengthwise thrust on the drum. The spacing collars completely fill the spaces between the hub of the drum and the respective frame members and the frame members are firmly held in engagement with the respective collars by means of the holding devices or caps 10 on the ends of the shaft. Consequently, when a thrust is imposed upon the drum the movement of the drum toward the frame member is pre- This vented by the spacing collar and the thrust which is imposed upon the frame member is received by the shaft and transmitted in part to the other frame member, and it will be observed that the construction is such as to not only tie together the frame members but to distribute the strain between the two frame members. Thus, we have very effectually overcome the tendency of the drum to travel along its shaft and the tendency of the frame members to spread,

WVhile we have shown and described one embodiment of our invention it will be 1111- derstood that this has been chosen for the scribed, a fixed frame having-supporting Copies of this patent may be obtained fdrlfive cents each, by addressing the Commissioner of Patents members, a shaft mounted on said supportmg members, a drum mounted on said shaft,

a cable wound about said drum and arranged to exert an axial thrust thereon, means carried by said shaft and in engagement with said drum and frame to prevent the axial movement of said drum, and means comprising said shaft to prevent the springing apart of said supporting members due to the resulting thrust against said frame and to divide said thrust between the two supporting members.

2. In a mechanism of the character described, a fixed supporting frame having bearings, a shaft mounted in said bearings, a drum mounted on said shaft, a cable wound about said drum and arranged to exert an axial thrust thereon, spacing sleeves fitting snugly between the ends of said drum and the supporting frame, and plates secured to the respective ends of said shaft and bearing against the outer sides of said frame.

3. In a mechanism of the character described, a fixed frame having supporting members, bearings in said supporting members, a shaft mounted in said bearings, .a drum mounted on said shaft, a cable wound about said drum and arranged to exert an axial thrust thereon, spacing means fitting snugly between said drum and the supporting frame, and means secured to the respective ends of said shaft to preventthe springing apart of the bearings and insuring that the-endwise thrust on said drum will be divided between the two frame members.

In testimony whereof, we affix our signatures in presence-of two witnesses.

- I CHARLES E. KING.

1 BENJAMIN J ACOBY.

. Witnesses:

FRANCIS BAUELL JENNINGS, HERBERT E. RoUsH.

I Washington, D. C. 

